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K_{l4} decays

An effective theory of large N_{C} QCD of mesons has been used to study six K_{l4} decay modes. It has been found that the matrix elements of the axial-vector current dominate the K_{l4} decays. PCAC is satisfied. A relationship between three form factors of axial-vector current has been found. Non-zero phase shifts are originated in ρ-->ππ. The decay rates are calculated in the chiral limit. In this study there is no adjustable parameter.